Good point, those aero power ratings are at around 20k feet. There was a tank/torpedo boat version of the merlin that made around 700hp but I don't remember the weight.
I guess we are getting off topic, but how much power would the merlin make on 91 octane nolead? The original merlin made about 1050hp on 100 octane ethyl (IIRC).
I love old Aero engines! They are like 2000hp swiss watches.
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